New Accounting Standards New Accounting Standards Adopted (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 29, 2019	Dec. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle
Operating lease assets	$ 919,283		$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Operating lease liabilities	1,011,000
Operating lease assets	934,000
Favorable leases	23,000
Unfavorable leases	30,000
Straight-line rent In excess of minimum rents paid	67,000
Cumulative effect on retained earnings, net of tax	$ (1,105)
Scenario, Forecast | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Effect on future earnings, amount		$ 40,000